Spinning device for production of spun thread from a fibre sliver

ABSTRACT

A device for the manufacture of a spun thread from a fiber sliver includes a fiber conveying channel with a fiber guidance surface. A yarn guidance channel includes an inlet mouth aperture disposed such that the fiber guidance surface guides fibers to the inlet mouth aperture. A fluid generating device creates eddy currents around the inlet mouth aperture to incorporate individual fibers into an end of a yarn being formed in the yarn guidance channel. The fiber guidance surface includes a fiber delivery edge having a shape and disposed relative to the inlet mouth aperture such that the fibers are guided over the delivery edge and conveyed to the inlet mouth aperture in an aligned generally flat planar formation.

FIELD OF THE INVENTION

The invention relates to a device for the production of a spun threadfrom a fibre sliver, encompassing a fibre conveying channel with a fibreguide surface for the guidance of the fibres of the fibre sliver intothe inlet aperture mouth of a yarn guidance channel, and furthercomprises a fluid device for the production of an eddy current aroundthe inlet aperture mouth of the yarn guidance channel.

BACKGROUND

Such a device is known from DE 44 31 761 C2 (U.S. Pat. No. 5,528,895)and is shown in FIGS. 1 and 1 a. In this, fibres are guided through afibre bundle passage 13 on a twisted fibre guidance surface, whichexhibits a “rear” edge 4 b about a “front” edge 4 c. The fibres are thenguided around what is referred to as a needle 5 into a yarn passage 7 ofwhat is referred to as a spindle 6, whereby the rear part of the fibresare rotated by means of an eddy current generated by nozzles 3 about thefront part of the fibres, already located in the yarn passage, with ayarn being formed as a result. Once this has been done, spinning takesplace, as is described later in connection with the invention.

The element referred to as the needle, and its tip about which thefibres are guided, is located close to or in the inlet aperture mouth 6c of the yarn passage 7 and serves as what is referred to as a falseyarn core, in order as far as possible to prevent or to reduce thepossibility that, due to the fibres in the fibre bundle passage, animpermissibly high false twist of the intertwined fibres occurs, whichwould at least interfere with the formation of the yarn if not evenpreventing it altogether.

FIG. 1 b shows this aforementioned prior art encumbered withdisadvantages (DE 41 31 059 C2, U.S. Pat. No. 5,211,001), in that, as isknown from DE 44 31 761, FIG. 5, the fibres are not guided consistentlyabout the needle as shown in FIG. 1 a, but are guided on both sides ofthis needle against the inlet aperture mouth of the yarn passage, whichapparently interferes with the binding of the fibres and apparently canlead to a reduction of the strength of the spun yarn.

FIG. 1 c shows a further development of FIG. 1, or 1 a respectively, inthat the fibre guidance surface 4 b, as can be seen, is designed in ahelical shape, and the fibres are accordingly likewise guided in helicalform in their course from the clamping gap X as far as the end e5 of thehelical surface, and are then wound, still in helical form, about afibre guidance pin, similar to the fibre guidance pin 5 of FIG. 1,before the fibres are acquired by the rotating air flow and twisted toform a yarn Y. In this situation, it can be seen that the rear ends ofthe fibres f″ are bent about the mouth part of the spindle 6, and inthis context are taken up by the rotating air flow and wound around thefront ends, which are already located in the center of the fibre run, inorder to form the yarn as a result.

FIG. 1 c corresponds to FIG. 6 from DE 19603291 A 1 (U.S. Pat. No.5,647,197), whereby the identification references of the spindle 6, theyarn passage 7, and the venting cavity 8 have been adopted from FIG. 1,while the element e2, which has a similar function to the needle 5 ofFIGS. 1 to 1 b has been left as it was. It can likewise be seen fromthis FIG. 1 c that the fibres are transferred from a helical formationto the inlet of this spindle.

A further prior art from the same Applicants is specified in JP 3-10 6468 (2) and seen in FIGS. 1 d and 1 e, which, by contrast with FIG. 1,does not exhibit a needle, but rather a truncated cone 5 a with a flatfibre guidance surface, which is a part of the fibre guidance channel13, and the tip of which is arranged essentially concentric to the fibreguidance run 7. The purpose of this cone is the same as that of the tip5, namely of producing what is referred to as a false yarn core in orderto prevent the fibres from being incorrectly twisted; in other words,that a false twist occurs from the tip backwards against the clampinggap of the output rollers, which would at least in part prevent a truetwist of the fibres such as to form the yarn.

SUMMARY

Objects and advantages of the invention will be set forth in part in thefollowing description, or may be obvious from the description, or may belearned through practice of the invention.

The problem was therefore to find a method and device in which thefibres undergo fibre guidance by means of which the fibres can be takenup by the air eddy which is created in such a way that a uniform andfirm yarn can be produced.

The problem was resolved in that a fibre guide surface exhibits a fibredelivery edge, over and by means of which the fibres are guided in aformation lying essentially flat next to one another, against an inletaperture mouth of a yarn guidance channel.

Further advantageous embodiments are provided in the other dependentclaims.

The invention is described hereinafter in greater detail on the basis ofdrawings which represent only some means of implementation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1–1 c Figures from DE 44 31 761 C2, whereby FIG. 1 b correspondsto the device from DE 41 31 059 C2 and FIG. 1 c the device from DE 19 6032 91 A1, corresponding to figures from JP3-10 63 68 (2);

FIGS. 1 d and 1 e Figures from JP3-10 63 68 (2);

FIG. 2 A first embodiment of the invention essentially according to thesection lines I—I (FIG. 2 b), whereby a middle element is representednot in section;

FIG. 2 a A section according to the sectional lines II—II of FIG. 2;

FIG. 2 b A cross-section according to the section lines III—III of FIG.2;

FIG. 2 c Represents a section taken from FIG. 2, represented as anenlargement;

FIG. 2.1 The same embodiment as FIG. 2, whereby the fibre or yarn flowis additionally shown;

FIG. 2 a.1 Corresponds to FIG. 2 a, whereby the fibre or yarn flow isadditionally shown, and a possible modification of the fibre deliveryedge is also represented;

FIG. 2 b.1 Corresponds to FIG. 2 b, whereby the fibre or yarn flow isadditionally shown;

FIG. 3 A second embodiment of the invention, essentially according tothe section lines I—I from FIG. 3 a;

FIG. 3 a A cross-section according to the section lines III—III of FIG.3

FIG. 3 b A cross-section corresponding to FIG. 3 a through a firstvariant of the second embodiment;

FIG. 3 c A cross-section corresponding to FIG. 3 a through a secondvariant of the second embodiment;

FIG. 3 d A cross-section corresponding to FIG. 3 a through a thirdvariant of the second embodiment;

FIG. 4 A third embodiment of the invention, essentially according to thesection lines I—I from FIG. 4 a;

FIG. 4 a A cross-section according to the section lines III—III of FIG.4;

FIGS. 5–5 b A further variant of the invention according to FIGS. 2–2 b;

FIGS. 6–6 b Another variant of the invention according to FIGS. 2–2 b;

FIG. 7 A further variant of the invention according to FIG. 3;

FIG. 7 a A cross-section according to the section lines IV—IV of FIG. 7;

FIG. 8 A representation of a drafting device as a fibre feed into theelement of FIG. 2.1; and

FIG. 9 A representation of a fibre releasing device as a fibre feed intothe element of FIG. 2.1.

SUPPLEMENTARY DESCRIPTION OF THE PRIOR ART

FIG. 1 shows a housing 1 with the housing parts 1 a and 1 b and with anozzle block 2 integrated in it which contains jet nozzles 3, by meansof which an eddy current as described heretofore is created, as well aswhat is referred to as a needle holder 4 with the needle 5 inserted init.

As can be seen from FIG. 1 a, the eddy current produces a right-handswirl in the direction of the arrow (seen looking towards the Figure),and accordingly the fibres F being delivered are conducted in thisdirection of rotation about the needle 5 against a face side 6 a of whatis referred to as the spindle 6 (FIG. 1), and introduced into a yarnpassage 7 of the spindle 6. In this situation, a relatively largedistance interval pertains between the nozzle block 2 and the face side6 a of the spindle, since space must pertain in this distance intervalfor the needle 5 and its tip.

The fibres F are conveyed in a fibre guidance channel 13 on what isreferred to as the fibre guide surface, by way of an aspirated air flow,against the tip of the needle 5.

The aspirated air flow is created on the basis of an injector effect ofthe nozzle jets 3, which are provided in such a way that, on the onehand the air eddy referred to is created, while on the other air is alsosucked in through the fibre conveying channel 13.

This air escapes along a conical section 6 b of the spindle 6 through anair escape cavity 8 into an air outlet 10.

The compressed air for the jet nozzles 3 is delivered to the jet nozzlesin a uniform manner by means of a compressed air distribution chamber11.

FIG. 1 b, which represents the prior art to FIGS. 1 and 1 a referred toheretofore, shows that this Figure, by contrast with FIG. 1 a,additionally exhibits a needle holder extension piece 4 a′, whichprojects from a face surface 4′ and contains the needle 5; i.e. thefibres are guided over the entire extension, which pertains because ofthe contour of the needle holder 4, against the inlet of the spindle 6.

FIGS. 1 c to 1 e have already been discussed. In this situation, theidentification numbers of these Figures which have not been mentioned donot have any explanation in this application. The disadvantage of thesedevices lies in the uncertain fibre guidance at a large distanceinterval from the face side of the needle holder 4 to the inlet mouthaperture 6 c in the face side 6 a of the spindle 6, as well as in theguidance of the fibres to or about the needle 5 or the cone element 5 aof FIGS. 1 d and 1 e respectively.

DETAILED DESCRIPTION

Reference is now made to embodiments of the invention, one or moreexamples of which are illustrated in the drawings. The embodiments areprovided by way of explanation of the invention, and not meant as alimitation of the invention. It is intended that the invention includemodifications and variations to the embodiments described herein.

In order to alleviate certain disadvantages of the prior art devices,according to FIGS. 2–2 c the invention exhibits a fibre delivery edge29, which is located very close to an inlet mouth aperture 35 (FIG. 2 a)of a yarn guidance channel 45, which is provided inside what is referredto as a spindle 32. For a special advantage, a specified distanceinterval A (FIG. 2 c) is defined between the fibre delivery edge 29 andthe inlet mouth aperture 35, and with a specified distance interval Bbetween an imaginary plane E which contains the edge, this plane runningparallel to a mid-line 47 of the yarn guidance channel 45, and thisaforesaid mid-line 47.

In this situation the distance interval A, depending on the fibre typeand mean fibre length, and on the relevant experimental results,corresponds to a range from 0.1 to 1.0 mm. The distance interval Bdepends on the diameter G of the inlet aperture mouth 35, and, dependingon experimental results, lies within a range from 10 to 40% of thediameter G referred to.

In addition to this, the fibre delivery edge exhibits a length D.1 (FIG.2 a), which is in a proportion of 1:5 to the diameter G of the yarnguidance channel 45, and is formed by a face surface 30 (FIG. 2) of afibre conveying element 27 and a fibre guidance surface 28 of theelement 27. In this situation, the face surface 30, with a height C(FIG. 2 c), lies within the range of the diameter G and exhibits anempirically-determined distance interval H between the plane E and theopposite inner wall 48 of the yarn guidance channel 45.

The fibre conveying element 27 is guided in a carrier element 37accommodated in a nozzle block 20, and together with this carrierelement forms a free space which creates a fibre conveying channel 26.

The fibre conveying element 27 exhibits at the inlet a fibre take-upedge 31, about which the fibres are guided, these being conveyed by afibre conveying roller 39. These fibres are raised from the fibreconveying roller 39 by means of a suction air flow from the conveyingroller, and conveyed through the fibre conveying channel 26. The suctionair flow is created by an air flow generated in jet nozzles 21 with ablast direction 38, on the basis of an injector effect.

The jet nozzles, as represented in FIGS. 2 and 2 b, are arranged in anozzle block 20 on the one hand at an angle β (FIG. 2), in order tocreate the injector effect referred to heretofore, and, on the other,are offset at an angle α (FIG. 2 b), in order to create an air eddywhich rotates with a direction of rotation 24 along a cone 36 of thefibre conveying element 27, and about the spindle front surface 34 (FIG.2 a), in order, as described hereinafter, to form a yarn in the yarnguidance channel 45 of the spindle 32.

The air flow created by the nozzles 21 in an eddy chamber 22 escapesalong a spindle cone 33, through an air escape channel 23 formed aroundthe spindle 32, into the atmosphere or into a suction device.

To form a yarn 46 (FIG. 2 a), the fibres F which are delivered from thefibre conveying roller 39, are raised from the fibre conveying roller 39by means of the suction air flow referred to in the fibre conveyingchannel 26, and are guided on the fibre guidance surface 28 in aconveying direction 25 (FIG. 2) against the fibre delivery edge 29. Fromthis delivery edge, front ends of the fibres are guided through thespindle inlet aperture mouth 35 into the yarn guidance channel 45, whilethe rear ends or the rear part 49 of these fibres are folded over assoon as the rear ends are free and taken up by the rotating air flow, sothat, with the further conveying of the fibres in the yarn guidancechannel 45, a yarn 46 is created which exhibits a yarn character similarto the ring yarn.

This process is represented in FIGS. 2.1 to 2 b.1. It can be seen inthese figures that the fibres F delivered with the fibre delivery roller39 are conducted in the conveying direction 25 on the fibre guidancesurface 28 against the fibre delivery edge 29, and specifically, asshown in FIG. 2 a.1, with a converging fibre flow, which tapersincreasingly towards the inlet aperture mouth 35 (FIG. 2 a). Thistapering is applied because the front ends, which are alreadyincorporated into the twisted yarn 46, have a tendency to migrate in thedirection of the tapering, so that front ends of fibres located furtherto the rear are likewise displaced in the direction of the tapering.This only happens, however, until the rear part 49 of the fibres F havebeen taken up by the air eddy referred to, and rotated around thespindle front surface 34 and drawn into the inlet aperture mouth 35 atthe thread draw-off speed, in the process acquiring the twist necessaryfor the formation of the yarn.

In FIG. 2 a, the width D.1, as shown by the broken lines, is representedin extended form, specifically on the one hand in order to show that thewidth can be extended, and, on the other, likewise to show that thisextended width will, under certain circumstances, reduce the size of theeddy chamber shown in FIG. 2 a, if not even changed with interferingeffect, in that the eddy current can no longer develop therein in such away that the fibre ends 49 can be taken up by the eddy flow with theenergy required. This too must be determined by means of empiricalexperiments.

The yarn formation referred to heretofore takes place after the start ofa spinning process of any kind, for example in which a yarn end of analready existing yarn is conducted back through the yarn guidancechannel 45 into the area of the spindle inlet mouth aperture 35sufficiently far for fibres of this yarn end to be opened sufficientlywide by the air flow, which is already rotating, that front ends offibres which are newly conducted to the fibre guidance channel 26 can betaken up by this rotating fibre sliver and, by repeat drawing of theyarn end which has been introduced, can be held in the sliver such thatthe following rear parts of the newly-delivered fibres can be woundaround the front ends which are already located in the mouth aperturesection of the yarn guidance channel, so that, as a consequence, theyarn referred to can be respun with an essentially pre-determinedarrangement.

The sequence has been described on the basis of an example in which thefront end of a fibre, seen in the direction of conveying, isincorporated in the fibre sliver, and the rear end of this fibre is orbecomes free to be “folded over.” The process can, however, take placein an analogous manner in the case of an incorporated rear end of thefibres, whereby the front end is free, and, because of the axialcomponent of the eddy air flow, is deposited at the spindle frontsurface 34. The fibre parts which are deposited on the spindle frontsurface 34 then rotate because of the eddy air flow, and are thereforewound around the fibre ends which have been bound in.

FIGS. 3 and 3 a show a further embodiment of the fibre guidance channel26 of FIGS. 2–2 c, in this case as the fibre guidance surface 28.1 withan elevation 40 arranged at a distance interval M from the fibredelivery edge 29, over which the delivered fibres slide before theyreach the fibre delivery edge 29. In this situation the distance Mcorresponds to a maximum of 50% of the mean fibre length.

The elevation exhibits a distance interval N to a fibre guidance surfacewithout elevation, which lies within the range of 10 to 15% of thedistance interval M.

The distance intervals M and N are to be determined empirically inaccordance with the fibre type and fibre length.

This elevation 40 can exhibit the shapes shown with FIGS. 3 a–3 d; i.e.the edge can be concave, according to FIG. 3 b, for example for“slippery” fibres to be explained later, convex according to FIG. 3 cfor “sticky” fibres, or, according to FIG. 3 d, wave-shaped.Correspondingly, the fibre guidance surfaces of FIGS. 3 b to 3 d aredesignated as 28.2, 28.3, and 28.4.

These shapes serve to provide different fibre guidance on the fibreguidance surface 28.1–28.4, and are to be determined empiricallyaccording to the fibre type and fibre length. In this situation, theterm “slippery” fibre is understood to mean such as exhibit weak mutualadhesion, and “sticky” fibres such as exhibit a stronger mutualadhesion. The elements which do not have characterization identificationcorrespond to the elements in FIGS. 2 to 2 c.

A further advantage of the elevation lies in the fact that, due to themovement of the fibres over this point, a loosening of possible dirtparticles inside the fibre sliver takes place, which are taken up by theconveying air flow and can be conveyed into the open air or into asuction device.

FIGS. 4 and 4 a show a further variant of the fibre guidance surface 28of FIGS. 2–2 c: fiber guidance surface 28.5. According to this variant,the fibre guidance surface exhibits, at a distance interval P from thefibre delivery edge 29 of a maximum of 50% of the mean fibre length, adepression 41 with a radius R.1, whereby the lowest point of thedepression 41 is located lower than the edge 29 of FIGS. 2–2 c. In thissituation the depression 41 and the radius R.1 are to be determinedempirically on the basis of the fibre type and fibre length, and thedepression 41 serves to prevent fibres (short fibres, for example) frommoving away sideways, i.e. of being lost as wastage.

As shown in FIG. 4, this variant can also be combined with the elevation40 (represented by a broken line) of FIGS. 3 and 3 a or 3 b to 3 d.

The elements which do not have characterization identificationcorrespond to the elements in FIGS. 2 to 2 c.

FIGS. 5–5 b show a further variant of the design of the fibre deliveryedge 29, in that the face surface 30.1 exhibits a convex roundingprovided with a radius R.2, and in this situation the fibre deliveryedge 29 acquired a width D.2. In this case too, the selection of theradius and the width is a matter of empirical experiments, in order tobe able to adapt to the fibre type and fibre length in a way optimum forthe yarn formation. In this situation, measures can also be applied toinfluence the optimization of the eddy chamber 22 from the technicalflow point of view, as mentioned earlier.

The elements which do not have characterization identificationcorrespond to the elements in FIGS. 2 to 2 c.

FIGS. 6–6 b show a similar variant concept, inasmuch as, in this case,it is not a convex face side 30.1 which is provided for, but a concaveface side 30.2, with a radius R.3 and an edge length of D.3. The radiusR.3 and the edge length D.3 must be determined empirically according tothe fibre length and the fibre type. These measures serve to influencethe tapering mentioned earlier of the fibre at the inlet aperture mouth.

The elements which do not have characterization identificationcorrespond to the elements in FIGS. 2 to 2 c.

FIGS. 7 and 7 a show a variant of FIGS. 3–3 d, in which the fibreguidance surface consists in this case of a porous place 42 made ofsinter material, so that compressed air from a cavity 43 located beneaththe porous plate 42 can flow in a very uniform and fine distributionthrough the porous plate and into the fibres located on this, so that,in a certain sense, a fluidization of the fibres takes place, i.e. ahomogenous mingling of air and fibres, which incurs a separation offibre from fibre, and therefore an increase in the “slipperiness”referred to, i.e. a reduction of the adhesion of the fibres referred toheretofore due to the air located between the fibres.

As a result of this separation, any dirt is more easily loosened andreleased, with the result that this dirt can be better acquired by thesuction air flow at the transition over the intermediate elevation 40.The compressed air for the cavity 43 is introduced via the compressedair feed 44.

The pressure in the cavity 43 is to be determined empirically inaccordance with the porous plate and the tolerable air outlet speed fromthe porous surface, and specifically in such a way that the fibres fromthis air flow is not raised above a tolerable value from the fibreguidance surface.

The porous plate is accommodated by the parts 27.1 and 27.2 of the fibreconveying element 27, whereby, because they contain the inlet edge andthe fibre delivery edge of the fibres, these parts are made of amaterial which is more resistant to wear than a porous plate.

FIG. 8 shows a nozzle block from FIG. 2.1 in combination with a draftingdevice 50, consisting of the inlet rollers 51, and apron pair 52 withthe corresponding rollers, and the outlet roller pair 53, which deliversthe fibre sliver F to the nozzle block 20. The fibres leave the draftingdevice 50 in a plane which contains the clamping line of the outerroller pair. This plane can be offset in relation to the fibre guidancesurface 28 in such a way that the fibre sliver is deflected at the fibretake-up edge 31 (see FIGS. 2 and 2 a respectively).

FIG. 9 shows, as an alternative to the drafting device, a device inwhich a fibre sliver 54 is broken up into individual fibres and in thefinal stage is delivered by means of a suction roller 62 as a fibresliver F to the nozzle block 20 of FIG. 2.1. This device is the objectof a PCT application with the number PCT/CH01/00 217 by the sameApplicants, to which application reference is made as a constituent partof this application. An alternative can be derived from U.S. Pat. No.6,058,693.

The fibre sliver break-up device according to FIG. 9 comprises a feedchannel 55, in which the fibre sliver 54 is delivered to a feed roller56, whereby the fibre sliver is conveyed onwards from the feed roller 56to a needle roller or toothed roller 61, by which the fibre sliver isbroken up into individual fibres. A feed trough 57 presses the fibresliver 54 against the feed roller, in order thereby to feed the fibresliver in metered fashion to the needle roller or toothed roller 61. Inthis situation the hinge 58 and the pressure spring 59 serve to allowfor the necessary pressure force.

In the next stage the needle roller 60 transfers the fibres to a suctionroller 62. In this situation the dirt, identified by a T, is separatedout.

With the help of the suction force, the suction roller 62 holds thefibres tightly in the area delimited by A to B, seen in the direction ofrotation, as far as the clamping point K. After this clamping point, thefibres are released for further conveying in the fibre guidance channel26. In the channel 26, the fibres are acquired by the air flow 25. Therelease referred to takes place, for example, because the suction effecton the suction roller 62 is no longer present after the clamping pointK, for example because the cover connecting the points A and B (shown inFIG. 9) is no longer provided after the clamping point K. The releasecan, however, be enhanced by means of an air blast B.2, which blowsthrough the holes 63 by means of the channel B.2. This air blast B.2can, however, be dispensed with. The channel B.2 is supplied withcompressed air via the channel B.1.

The fibres leave the suction roller 62 in a plane which contains theclamping line K. This plane can be offset in relation to the fibreguidance surface 28 in such a way that the fibre sliver is deflected atthe fibre take-up edge 31 (see FIGS. 2 and 2 a respectively).

As far as the drafting device from FIG. 8 is concerned, this is agenerally known drafting device system, and it is accordingly notconsidered in any further detail.

From FIGS. 8 and 9, it can be seen that the fibre conveying channel 26is provided with a fibre guidance surface 28, which is designed withouta twist (or without a helix) (see FIGS. 1 a and 1 c respectively). Thefibre guidance surface 28 leads to a fibre delivery edge 29, which ispositioned in relation to the inlet aperture mouth 35 of the yarnguidance channel in such a way that the fiber sliver F must come incontact with the edge 29 in order to enter into the inlet aperture mouth35. As a result of this, a continuation of a yarn rotation, upstream ofthe edge 29, is prevented or at least substantially reduced.

It can be seen from the same figures that the fibre conveying channel 26is located on the one hand entirely on one side of an imaginary plane(not shown) running perpendicular seen looking towards FIG. 2, andcontains the mid-line 47 of the yarn channel 45. The fibre conveyingchannel 26, on the other hand, is also run close to the inlet aperturemouth 35 of the yarn guidance channel 45 in such a way that, in thecombination of the two measures, at least a part of the fibre sliver Fmust be deflected in order to pass out of the fibre conveying channel 26into the yarn guidance channel 45 (see FIGS. 1 a and 1 c respectively,where, as a departure to what has gone before, a substantial distanceinterval pertains between the end of the fibre guidance channel and thespindle, in order to allow for the provision of the needle 5 in theintermediate space).

In the preferred embodiment (FIGS. 8 and 9), the fibre delivery edge 29of the fibre conveying channel 26 is provided in a plane E (FIG. 2 c)parallel to the first plane mentioned, containing the mid-line 47, saidplane being arranged at a predetermined interval B from the plane firstreferred to.

FIGS. 8 and 9 also show that the fibres which in operation leave thefibre conveying channel 26 enter directly into the area (space 22, FIG.2) in which the eddy flow is present. This also represents a change inrelation to the arrangement according to FIG. 1, because in this latterarrangement a distance interval pertains between the end of the fibreguidance channel 13 and the plane in which the outlet aperture mouths ofthe blower nozzles 3 are located.

It should be appreciated by those skilled in the art that modificationsand variations can be made to the embodiments described herein withoutdeparting from the scope and spirit of the invention as set forth in theamended claims and their embodiments.

1. A device for the manufacture of a spun thread from a fiber sliver, said device comprising: a fiber conveying channel with a fiber guidance surface, and a yarn guidance channel having an inlet mouth aperture, said fiber guidance surface disposed to guide fibers conveyed therealong to said inlet mouth aperture; a fluid generating device that creates eddy currents around said inlet mouth aperture to incorporate individual fibers introduced to said inlet mouth aperture into an end of a yarn being formed in said yarn guidance channel; and said fiber guidance surface further comprising a fiber delivery edge having a shape and disposed relative to said inlet mouth aperture such that the fibers are guided over said delivery edge and conveyed to said inlet mouth aperture in an aligned generally flat planar formation.
 2. The device as in claim 1, wherein said fiber delivery edge is defined at an interval distance (A) from said inlet mouth aperture in the direction of fiber flow and a predetermined interval distance (B) from a mid-line axis of said yarn guidance channel in a direction generally perpendicular to said mid-line axis.
 3. A device for the manufacture of a spun thread from a fiber sliver, said device comprising: a fiber conveying channel with a fiber guidance surface, and a yarn guidance channel having an inlet mouth aperture, said fiber guidance surface disposed to guide fibers conveyed therealong to said inlet mouth aperture; a fluid generating device that creates eddy currents around said inlet mouth aperture to incorporate individual fibers introduced to said inlet mouth aperture into an end of a yarn being formed in said yarn guidance channel; and said fiber guidance surface further comprising a fiber delivery edge having a shape and disposed relative to said inlet mouth aperture such that the fibers are guided over said delivery edge and conveyed to said inlet mouth aperture in an aligned generally flat planar formation; and wherein said fiber guidance surface further comprises an elevation component at a predetermined distance before said fiber delivery edge in the direction of fiber flow, said elevation having one of a straight, curved concave, curved convex, or combined curved concave and curved convex cross-sectional shape.
 4. The device as in claim 3, wherein said elevation is at an elevation height above said fiber delivery edge such that dirt particles conveyed in the fiber stream are deflected away as the fibers are deflected by said elevation prior to reaching said fiber delivery edge.
 5. The device as in claim 1, wherein said fiber guidance surface comprises a channel-shaped depression extending to said fiber delivery edge, said depression forming fibers conveyed along said fiber guidance surface into a specified width prior to the fibers being conveyed over said fiber delivery edge.
 6. The device as in claim 3, wherein said fiber guidance surface is formed at least partially by an air-permeable material that is in communication with a compressed air source such that compressed air flows through said air permeable material for influencing alignment and separation of fibers conveyed along said fiber guidance surface and aiding in separation of dirt particle from the fibers.
 7. The device as in claim 6, wherein said air permeable material comprises pores of a size such that the fibers are fluidized by the compressed air passing through said pores.
 8. The device as in claim 7, wherein the location of the air permeable material and the volume and speed of the fluidizing air is maintained such that the fibers are not lifted from said fiber delivery edge as they are conveyed to said inlet mouth aperture.
 9. The device as in claim 1, wherein said fiber guidance surface terminates in a front face disposed generally perpendicular to a mid-line axis of said yarn guidance channel, said front face having a shape that at least partially determines a shape of said fiber delivery edge.
 10. The device as in claim 9, wherein said front face has one of a concave, convex, or wave-shaped profile.
 11. A device for the manufacture of a spun thread from a fiber sliver, said device comprising: a fiber conveying channel with a fiber guidance surface, and a yarn guidance channel having an inlet mouth aperture and a mid-line longitudinal axis, said fiber guidance surface disposed to guide fibers conveyed therealong to said inlet mouth aperture; a fluid generating device that creates eddy currents around said inlet mouth aperture to incorporate individual fibers introduced to said inlet mouth aperture into an end of a yarn being formed in said yarn guidance channel; and said fiber guidance surface being disposed in a generally flat plane without a helix or twisting component preceding a fiber delivery edge in a direction of fiber flow, said fiber delivery edge having a shape and disposed relative to said mid-line longitudinal axis of said inlet mouth aperture such that the fibers are caused to contact said fiber delivery edge prior to being introduced into said inlet mouth aperture, whereby a tendency for propagation of false twist upstream of said fiber delivery edge is minimized.
 12. A device for the manufacture of a spun thread from a fiber sliver, said device comprising: a fiber conveying channel having a fiber delivery edge, and a yarn guidance channel having an inlet mouth aperture and a mid-line longitudinal axis, said fiber conveying channel disposed to guide fibers conveyed therealong to said inlet mouth aperture; a fluid generating device that creates eddy currents around said inlet mouth aperture to incorporate individual fibers introduced to said inlet mouth aperture into an end of a yarn being formed in said yarn guidance channel; and said fiber conveying channel disposed entirely above a horizontal plane containing said mid-line longitudinal axis such that the fibers are deflected around said fiber delivery edge prior to being introduced into said inlet mouth aperture.
 13. The device as in claim 12, wherein said fiber conveying channel is defined in a plane generally parallel to said horizontal plane.
 14. The device as in claim 13, wherein said fiber conveying channel is disposed relative to said inlet mouth aperture such that fibers leaving said fiber conveying channel enter directly into an area in which the eddy currents are present.
 15. A device for the manufacture of a spun thread from a fiber sliver, said device comprising: a fiber conveying channel with a fiber guidance surface, and a yarn guidance channel having an inlet mouth aperture, said fiber guidance surface disposed to guide fibers conveyed therealong to said inlet mouth aperture; a fluid generating device that creates eddy currents around said inlet mouth aperture to incorporate individual fibers introduced to said inlet mouth aperture into an end of a yarn being formed in said yarn guidance channel; and said fiber guidance surface comprising a fiber delivery edge disposed at an interval distance (A) from said inlet aperture mouth in a range of from about 0.1 to 1.0 mm and at an interval distance (B) from a mid-line axis of said yarn guidance channel in a direction generally perpendicular to said mid-line axis in a range of from about 10% to about 40% of a diameter of said inlet mouth aperture.
 16. The device as in claim 2, wherein said distance interval (A) is in a range of from about 0.1 mm to about 1.0 mm, and said distance interval (B) is in a range of from about 10% to about 40% of a diameter of said yarn guidance channel.
 17. The device as in claim 4, wherein said elevation is at a maximum distance (M) from said fiber delivery edge of about 50% of a mean fiber length of fibers conveyed through said device.
 18. The device as in claim 17, wherein said elevation has an elevation height that is in a range of from about 10% to about 15% of said distance (M).
 19. The device as in claim 5, wherein said depression extends a maximum distance (P) from said fiber delivery edge of about 50% of a mean fiber length of the fibers conveyed through said device, and has a curved cross-section with a predetermined radius.
 20. The device as in claim 1, wherein said fiber delivery edge comprises a transverse width that is in a proportion of about 1:5 with a diameter of said yarn guidance channel. 